JP3456315B2 - Cooling fan mounting structure for internal combustion engine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling fan mounting structure for an internal combustion engine, and more particularly to a cooling fan mounting structure for an internal combustion engine capable of reducing a front-rear length of a mounting portion of the cooling fan.

[0002]

2. Description of the Related Art In an internal combustion engine, a water cooling type or a cold type cooling device is provided in order to cool each part to an appropriate temperature.

In the water-cooled cooling device, the cooling water is forcedly circulated in the internal combustion engine by driving the water pump, the cooling water heated by the internal combustion engine is sent to the radiator, and the cooling water flowing through the radiator is supplied. Is cooled by a cooling fan, and the cooled cooling water is sent to the water pump again.

That is, as shown in FIGS. 17 and 18, the internal combustion engine 102 includes a cylinder block 104 and a cylinder head 1.
It has 06, a crankcase 108, and an oil pan 110. A crankshaft 112 is axially supported between the lower part of the cylinder block 104 and the upper part of the crankcase 108.

A crank pulley 114 is fixed to the end portion of the crank shaft 112 by a crank bolt 116.

A water pump 118 is attached to the cylinder block 104 above the crankshaft 112.

In this water pump 118, a pump case 120 is fixed to the cylinder block 104 with a case mounting bolt 122, and the bearing 12 is attached to the pump case 120.
4, a pump shaft 126 is pivotally supported, and a cooling fan pulley 130 is fixedly mounted on the pump shaft 126, which is a support member, via a hub 128. Also, hub 1
A cooling fan 132 is provided at 28 by means of fan mounting bolts 134.

Further, as a structure in which the cooling fan is separately attached to the cylinder block instead of the water pump, there is a structure shown in FIG.

In FIG. 19, a cylinder block 202
The bearing housing 204 is attached to the housing mounting bolt 206.
Mounted in the bearing housing 204 by the bearing 2
No. 08 is provided, a rotary shaft 210 is rotatably supported by the bearing 208, and a cooling fan pulley 214 is fixedly mounted on the rotary shaft 210 serving as a support via a hub 212.
A cooling fan 216 is fixed to the hub 212 with a fan mounting bolt 218.

As a structure for mounting a cooling fan integrally with a water pump, for example, an actual flat plate 2-141 is used.
No. 626 and Japanese Utility Model Laid-Open No. 2-149822. The one disclosed in Japanese Utility Model Laid-Open No. 2-141626 has a water pump impeller at the inner end of the rotating shaft of the water pump and a cooling fan at the outer end of the rotating shaft, which is the same as when rotating. A water pump pulley is provided to have a rotation center. Actual Kaihei 2-1
According to Japanese Patent Publication No. 49822, a fan pulley is arranged so as to surround a bearing supporting portion of a pump housing, and a lower portion of a buffer chamber formed between the seal material disposing portion and the bearing disposing portion in the bearing supporting portion. A water drainage hole is formed on the inner surface of the fan pulley, and a water reservoir is formed on the inner surface of the fan pulley.

[0011]

However, in the conventional cooling fan mounting structure, it is necessary to press the hub into the pump shaft or the rotary shaft, which is a support, so that the pump shaft or the rotary shaft is long. Required, and in order to press the outer ring of the bearing against the bearing housing, it is necessary to make the outer ring a certain length, which causes the position of the cooling fan attached to the hub to be far from the position of the bearing. It is necessary to increase the capacity of. In addition, it is difficult to bring the center of the belt of the cooling fan pulley close to the center of the bearing, which increases the capacity of the bearing.

As a result, the front-back length of the bearing portion becomes large at the mounting portion of the cooling fan, the mountability in the engine room of the internal combustion engine deteriorates, the bearing becomes large, and a hub is also required. However, there was an inconvenience that the cost increased.

[0013]

In order to eliminate the above-mentioned inconvenience, the present invention provides a cooling system for an internal combustion engine in which a cooling fan pulley and a cooling fan are fixedly provided on a support body supported by a cylinder block. In the fan mounting structure, a cooling fan arm is integrally provided on the cooling fan pulley via a bearing, and the cooling fan arm extends at right angles to an insertion portion to be inserted into the bearing and an insertion center of the insertion portion. The cooling fan arm is provided with an elongated hole for a belt tensioning bolt and a fixing bolt hole, and the cooling fan arm is attached to a mounting bracket of another accessory fixed to the cylinder block. The pulley is attached so that it can be moved and stretch the cooling fan belt. .

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, a cooling fan arm is integrally provided on a cooling fan pulley via a bearing, and this cooling fan arm is provided with respect to an insertion portion to be inserted into the bearing and an insertion center of this insertion portion. It consists of a mounting part that extends at a right angle, this mounting part is provided with a belt tension bolt long hole and a fixing bolt hole, and the cooling fan arm is cooled to the mounting bracket of other auxiliary equipment fixedly mounted on the cylinder block. Since the fan pulley is mounted so that it can be moved and stretch the cooling fan belt, the front-rear length of the bearing part is reduced at the mounting part of the cooling fan to improve the mountability of the internal combustion engine in the engine room. At the same time, we made the parts smaller and lighter,
Moreover, the capacity of the bearing can be reduced.

[0015]

Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 16 show an embodiment of the present invention. 15 and 16, 2 is an internal combustion engine, 4 is a cylinder block, 6 is a cylinder head, 8
Is a crankcase, 10 is an oil pan, 12 is an oil pump, 14 is an alternator, 16 is an air conditioner compressor, 18 is a water pump, and 20 is a power steering pump.

A crankshaft 22 is axially supported on the lower portion of the cylinder block 4 and the upper portion of the crankcase 8. In addition, the cylinder head 6 includes the intake side camshaft 2
4 and the exhaust side cam shaft 26 are provided so as to be pivotally supported.

A crank pulley 28 is attached to the crankshaft 22.
Are fixed by crank bolts 30.

A cooling fan 32 is attached to the cylinder block 4 above the crank pulley 28.

The cooling fan 32 includes a cooling fan pulley 34 and the cooling fan pulley 34.
Is supported by the cylinder block 4 by means of a cooling fan arm 38 which is integrally provided via a bearing 36.

The cooling fan pulley 34 is shown in FIG.
As shown in FIG. 6, the fan mounting screw holes 42, 42, 42, 42 are circumferentially equidistantly provided on the protrusions 40, 40, 40, 40 projecting inward on the front side on the left side of the belt center C1.
Is formed, and bearing holes 46 are formed by the bearing press-fitting inner surface 44 from the back side on the right side of the belt center C1. Further, the caulking portions 48, 4 are formed on the back side at even intervals in the circumferential direction.
8, 48 are formed. This caulking part 48, 48, 48
Between the crank pulley relief parts 50, 50, 50
Is formed by being cut out.

A bearing 36 is press-fitted into the bearing hole 46 of the cooling fan pulley 34, as shown in FIGS. The bearing 36 includes an inner ring 52 and an outer ring 54.
And a plurality of balls 56 and 58 arranged side by side in two rows between the inner ring 52 and the outer ring 54. The outer ring 54 is press-fitted in contact with the bearing press-fitting inner surface 44 of the cooling fan pulley 34, and as shown in FIGS. It is fixed by caulking 60 on the back side of.

A cooling fan arm 38 is attached to the inner ring 52 of the bearing 36.

This cooling fan arm 38 is shown in FIG.
As shown in FIGS. 12 to 12, an insertion portion 62 to be inserted into the inner ring 52,
The insertion portion 62 includes an attachment portion 64 extending at a right angle to the insertion portion center C2. The insertion portion 62 has a retaining bolt screw hole 66 formed from the front side in parallel with the insertion portion center C2, and a locking step portion 68 for locking the inner ring 52 on the outer peripheral surface. For the retaining bolt screw hole 66,
A retaining bolt 70, which contacts the inner ring 52 from the front side and prevents the bearing 36 from coming off, is screwed on. Also, the mounting portion 64
A belt-tightening bolt insertion hole 72, a fixing bolt hole 74, and a fixing bolt elongated hole 76 are formed therein. The belt tension bolt 7 is inserted into the belt tension bolt insertion hole 72.
8 is inserted.

Further, the mounting portion 64 of the cooling fan arm 38 is supplemented by another first fixing bolt 80 which is inserted into the fixing bolt hole 74 and a second fixing bolt 82 which is inserted into the fixing bolt elongated hole 76. It is attached to an air conditioner bracket 84 which is a mounting bracket of the machine. The air conditioner bracket 84 is fixed to the cylinder block 4.

Thus, the cooling fan arm 38
As a reason for mounting the cooling fan on the air conditioner bracket 84, mounting the cooling fan directly on the cylinder block is generally used for FR vehicles in which the internal combustion engine is often installed vertically. If this internal combustion engine is used in an FF vehicle in which the internal combustion engine is installed horizontally, a cooling fan becomes unnecessary. For this reason,
When the cooling fan arm is directly attached to the chain cover, it is necessary to close various holes, and in reality, it is necessary to fix it to the cylinder block via the chain cover, so the length of the mounting bolts also becomes long. However, problems often occur in terms of rigidity. Therefore, it is necessary to use two chain covers for each of the FF vehicle and the FR vehicle, or to use a blind plug.

A cooling fan belt 86 is wound around the crank pulley 28 and the cooling fan pulley 34.

The cooling fan 32 is attached to the cooling fan pulley 34 by means of a fan mounting bolt 88 screwed into the fan mounting screw hole 42.

Next, the operation of this embodiment will be described.

When the cooling fan belt 86 is stretched, the belt tension bolts 78 are loosened so that the cooling fan belt 86 is stretched.
When 8 is rotated, the cooling fan pulley 34 moves via the bearing 36 integral with the cooling fan arm 38, and the cooling fan belt 86 can be stretched.

Further, in this embodiment, the cooling fan pulley 34 and the cooling fan arm 38 are integrated, and the cooling fan pulley 34 has a bearing 36.
Since the bearing is press-fitted, the front-rear length of the bearing portion at this mounting portion is reduced, and the mountability of the internal combustion engine 2 in the engine room can be improved.

Further, parts such as the bearing 36 can be made smaller and lighter, and the cost can be reduced.

Further, the bearing 52 can be arranged near the cooling fan 32, and the bearing center C3 can be laid out near the belt center C1 of the cooling fan 34, and the capacity of the bearing 36 can be reduced. The cost can be reduced.

Furthermore, by disposing the caulking portions 48, 48, 48 intermittently on the back surface of the cooling fan pulley 34 and forming the pulley relief portions 50, 50, 50, as shown in FIG. Fan arm 3
8 the crank pulley 28 and the cooling fan pulley 34
It is possible to avoid the interference with.

The front surface of the bearing 36 is retained by a retaining bolt 70, and the rear surface thereof is caulked 60.
Since it is provided, there is no risk of it falling off.

[0035]

As is apparent from the above detailed description, according to the present invention, the cooling fan pulley is integrally provided with the cooling fan arm via the bearing, and the cooling fan arm and the insertion portion to be inserted into the bearing. It consists of a mounting part that extends at right angles to the insertion center of this insertion part,
This mounting part has a long hole for belt tensioning and a fixing bolt hole, and the cooling fan arm moves the cooling fan pulley to the mounting bracket of another accessory fixed to the cylinder block to stretch the cooling fan belt. Since it is mounted so that it can be installed in the engine room of the internal combustion engine, the front-rear length of the bearing can be reduced at the mounting site of the cooling fan, and the parts can be made smaller and lighter. Moreover, the capacity of the bearing can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a state in which a cooling fan pulley, a bearing, and a cooling fan arm are integrally attached.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a rear view of FIG.

FIG. 4 is a front view of a cooling fan pulley.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is a rear view of the cooling fan pulley.

FIG. 7 is a front view of a cooling fan arm.

FIG. 8 is a plan view of a cooling fan arm.

FIG. 9 is a bottom view of the cooling fan arm.

FIG. 10 is a rear view of the cooling fan arm.

11 is a sectional view taken along line XI-XI of FIG.

12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a front view of an arrangement state of a cooling fan pulley and a crank pulley.

14 is a sectional view taken along line XIV-XIV in FIG.

FIG. 15 is a sectional view of an internal combustion engine.

FIG. 16 is a front view of an internal combustion engine.

FIG. 17 is a sectional view of a conventional internal combustion engine.

FIG. 18 is a front view of a conventional internal combustion engine.

FIG. 19 is a schematic view of a mounting portion of a conventional cooling fan.

[Explanation of symbols]

2 Internal combustion engine 4 cylinder block 8 crankcase 22 crankshaft 28 crank pulley 32 Cooling fan 34 Cooling fan pulley 36 bearings 38 Cooling fan arm 86 Cooling fan belt

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F01P 5/02-5/04

Claims (5)

(57) [Claims] 1. A cooling fan mounting structure for an internal combustion engine in which a cooling fan pulley and a cooling fan are fixedly provided on a support member supported by a cylinder block, wherein a cooling fan arm is mounted on the cooling fan pulley via a bearing. Provided integrally , this cooling ring
The arm arm is an insertion part to be inserted into the bearing and the insertion part of this insertion part.
It consists of a mounting part that extends at a right angle to the insertion center.
The mounting part of the
And the cooling fan arm includes the cylinder block.
The above bracket should be attached to the mounting bracket of the other accessory that is fixed to the lock.
Cooling fan pulley moves and the cooling fan bell
A cooling fan mounting structure for an internal combustion engine, characterized in that it is mounted so that it can be stretched . 2. The cooling fan attachment structure for an internal combustion engine according to claim 1, wherein the cooling fan pulley is a cooling fan pulley in which the bearing is press-fitted and fixed by caulking on a back surface side. 3. The bearing is characterized in that the rear surface side of the cooling fan pulley is caulked intermittently in the circumferential direction in order to avoid interference with the crank fan pulley. Item 2. A cooling fan mounting structure for an internal combustion engine according to Item 1. 4. The cooling fan mounting structure for an internal combustion engine according to claim 1, wherein the bearing is a bearing in which an outer ring contacts the cooling fan pulley and an inner ring contacts the cooling fan arm. 5. The bearing is the cooling fan pool.
The retaining bolts from the front side of the
The cooling fan mounting structure for an internal combustion engine according to claim 1, which is a bearing .